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What is the real purpose of an oil refinery?
  • A: A refinery is where an oil well extracts oil from underground.
  • B: A refinery is where crude oil is burned so that only gasoline remains.
  • C: A refinery is where carbon and hydrogen atoms are assembled into alkane fuels.
  • D: A refinery is where crude oil is heated and vaporized, so that different molecules can be isolated.